Synovial fluid inside the joint keeps the joint surfaces lubricated, like oil lubricates the parts of a machine. This fluid is contained inside the joint by the joint capsule, a watertight sac of soft tissue and ligaments that fully surrounds and encloses the joint.
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These two vertebrae are the reason your neck can move in so many directions. The atlas is the first cervical vertebra-the one that sits between the skull and the rest of the spine.

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